This set of Electronic Devices and Circuits Multiple Choice Questions & Answers (MCQs) focuses on “Basic MOSFET Amplifier Configurations”.
1. In which of the following configuration does a MOSFET works as an amplifier?
a) Common Source (CS)
b) Common Gate (CG)
c) Common drain (CD)
d) All of the mentioned
View Answer
Explanation: There are three basic configurations for connecting the MOSFET as an amplifier. Each of these configurations is obtained by connecting one of the three MOSFET terminals to ground, thus creating a two-port network with the grounded terminal being common to the input and output ports.
2. The MOSFET in the following circuit is in which configuration?
a) Common Source (CS)
b) Common Gate (CG)
c) Common Drain (CD)
d) None of the mentioned
View Answer
Explanation: It is the circuit for Common gate configuration.
3. The MOSFET in the following circuit is in which configuration?
a) Common Source (CS)
b) Common Gate (CG)
c) Common Drain (CD)
d) None of the mentioned
View Answer
Explanation: It is the circuit for Common drain configuration.
4. The MOSFET in the following circuit is in which configuration?[/expand]
a) Common Source (CS)
b) Common Gate (CG)
c) Common Drain (CD)
d) None of the mentioned
View Answer
Explanation: It is the circuit for Common source configuration.
5. The circuit below is the characterization for the amplifier as a functional block. If the value of Rin for the common source configuration is R1 and that for common source with a source resistance configuration is R2 ideally. The ratio of R1/R2 will be
a) R1/R2 = 1
b) 0 < R1/R2 < 1
c) R1/R2 > 1
d) R1/R2 = 0
View Answer
Explanation: Ideally both must have infinite resistance.
6. The circuit below is the characterization for the amplifier as a functional block. Which is true for the value of Avo for common source (Represented by A1) and common source with a source resistance (represented by A2).
a) A1 = A2
b) A1 > 2
c) A1 < A2
d) |A1| < |A2|
View Answer
Explanation: A1 = -gmRD and A2 = -gmRD/1+gmRS
Reference circuit for Common source configuration
Reference circuit for common source with source resistance RS
7. Which of the following is true for the voltage gain (AV) for the common source configuration (represented by A1) and the common gate configuration (represented by A2) in the following circuit?
a) A1 = A2
b) |A1| = |A2| and A1 ≠ A2
c) |A1| > |A2|
d) |A1| < |A2|
View Answer
Explanation: A1 = -gm(RL||RD) and A1 = gm(RL||RD)
Reference figure for common source configuration
Reference figure for common gate configuration
8. The circuit below is the characterization for the amplifier as a functional block. The value of the voltage gain (Av) for the common source with source resistance (represented by A1) and common gate configuration (represented by A2) are related to each other by
a) A1 > A2
b) |A1| > |A2|
c) A1 < A2
d) A1 > A2 and |A1| > |A2|
View Answer
Explanation: A1 = – gm(RL||RD)/ 1 + gmRS and
A2 = gm(RL||RD)
Reference figure for common source with source resistance configuration
Reference figure for common gate configuration
9. In which of the following configuration is the input resistance (Ri) not equal to zero ideally?
a) Common source configuration
b) Common source configuration with source resistance
c) Common gate configuration
d) Source follower configuration
View Answer
Explanation: Refer to the circuit for the common gate configuration
10. Which of the following has AVO independent of the circuit elements?
a) Common source configuration
b) Common gate configuration
c) Source follower configuration
d) None of the mentioned
View Answer
Explanation: AVO = 1 source follower.
Sanfoundry Global Education & Learning Series – Electronic Devices and Circuits.
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